CN103546714A - Method and device for processing HDMI signal - Google Patents

Abstract

The invention relates to a method and device for processing an HDMI signal. The type of the received HDMI signal is firstly determined when the HDIM signal is received, the received HDMI signal is converted into a conventional YCbCr signal when the received HDMI signal is a video signal instead of the conventional YCbCr signal, image quality processing is conducted on the conventional YCbCr signal obtained through conversion, the conventional YCbCr signal undergoing image quality processing is converted into a conventional RGB signal to be output, no bright detail frames or dark detail frames in the video signal can be lost when image quality processing and outputting are conducted, and therefore the display frame contrast ratio of a piece of video is higher, and frames are clearer.

Description

The method and apparatus that HDMI signal is processed

Technical field

The present invention relates to signal processing technology field, relate in particular to a kind of method and apparatus that HDMI signal is processed.

Background technology

HDMI signal has YCbCr, and (" Y " refers to luminance component, " Cb " refers to chroma blue component, " Cr " refers to red color component) and RGB(R is red, G is green, B is blue) two kinds of color space coded systems, YCbCr is mainly used in video playback and shows, and RGB is mainly used in computer desktop and shows.In video playback apparatus, the YCbCr coding regulation Y of 8 is between 16 to 235, and Cb and Cr, between 16 to 240, are commonly referred to as Limited Range(limited range).And in computer display device, the RGB coding regulation R/G/B of 8 all, between 0 to 255, is commonly referred to as Full Range(infinite range).But relevant routine also stipulates, the YCbCr of 8, RGB also can encode with Full Range, Limited Range respectively.When YCbCr encodes with Full Range, Y/Cb/Cr is all between 0 to 255; When RGB encodes with Limited Range, R/G/B is all between 16 to 235.

The indicating characteristic classification of pressing HDMI signal, can be divided into two kinds of desktop signals, vision signals.Desktop signals is as the signal of webpage, browser, application interface, game etc., and vision signal is as signals such as played in full screen video such as disc player, Set Top Box, video camera, computers.For various HDMI output equipments, its vision signal has conventional YCbCr signal (YCbCr_16～235), unconventional YCbCr signal (YCbCr_0～255), conventional rgb signal (RGB_0～255) and four kinds of coded systems of unconventional rgb signal (RGB_16～235), and desktop signals has RGB_0～255 and RGB_16～235 two kind of coded system.Generally speaking, vision signal will have " picture quality enhancement " processing procedure accordingly, and desktop signals is particular about reproducibility, does not need to do picture quality enhancement and processes.

Existing way is generally first identification signal type (RGB/YCbCr), and rgb signal is unified by 0～255 processing, and YCbCr signal is unified processes (being that unconventional signal and normal signal are all processed according to normal signal) by 16～235.But problem is, if 16～235 rgb signal is directly exported processing by 0～255 signal, the equal nothing of bright in display frame, dark details, cause contrast inadequate, picture covers partially, lack unity and coherence, and if 0～255 YCbCr signal directly carries out picture quality enhancement processing by 16～235 signals, 0～16 all by 16, process, 235～255 all process by 235, and bright, dark information is reamed, and causes bright, dark picture detail and loses, picture contrast is poor, causes the display effect of HDMI signal poor.

Summary of the invention

Main purpose of the present invention is to provide a kind of method and apparatus that HDMI signal is processed, and makes the display effect of terminal HDMI signal better.

The present invention proposes a kind of method that HDMI signal is processed, and comprising:

The HDMI signal that detecting HDMI interface receives, the type of definite HDMI signal detecting;

When the HDMI signal detecting is vision signal, and while not being conventional YCbCr signal, the HDMI signal detecting is converted to conventional YCbCr signal;

Conventional YCbCr signal after conversion is carried out to image quality processing, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

Preferably, after the step of the type of described definite HDMI signal detecting, also comprise:

When the HDMI signal detecting is desktop signals, and while being unconventional rgb signal, the HDMI signal detecting is converted to conventional rgb signal output.

When the HDMI signal detecting is desktop signals, and while being conventional rgb signal, the HDMI signal that directly output detects.

Preferably, the HDMI signal that described detecting HDMI interface receives, determine that the step of the type of the HDMI signal detecting also comprises afterwards:

When the HDMI signal detecting is vision signal, and while being conventional YCbCr signal, the HDMI signal detecting is carried out to image quality processing, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

Preferably, the described step that the HDMI signal detecting is converted to conventional YCbCr signal comprises:

If the HDMI signal detecting is conventional rgb signal, conventional rgb signal is converted to conventional YCbCr signal;

Conventional YCbCr signal after conversion is carried out to image quality processing, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

Preferably, the described step that the HDMI signal detecting is converted to conventional YCbCr signal also comprises:

If described HDMI signal is unconventional rgb signal, described HDMI signal is converted to conventional rgb signal;

Conventional rgb signal is converted to conventional YCbCr signal;

Conventional YCbCr signal after conversion is carried out to image quality processing, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

Preferably, the described step that the HDMI signal detecting is converted to conventional YCbCr signal also comprise:

If the HDMI signal detecting is not rgb signal, the HDMI signal detecting is converted to conventional YCbCr signal;

Conventional YCbCr signal after conversion is carried out to image quality processing, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

Preferably, after the step of the HDMI signal that described detecting HDMI interface receives, the method also comprises:

Determine the signal processing model of HDMI interface place terminal;

If determine, the signal processing model of HDMI interface place terminal is video mode, and whether the HDMI signal that judgement detects is conventional YCbCr signal;

When the HDMI signal detecting is not conventional YCbCr signal, the HDMI signal detecting is converted to conventional YCbCr signal;

Conventional YCbCr signal after conversion is carried out to image quality processing, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

Preferably, after the step of the signal processing model of described definite HDMI interface place terminal, the method also comprises:

If determine, the signal processing model of HDMI interface place terminal is desktop, and whether the HDMI signal that judgement receives is conventional rgb signal;

When the HDMI signal detecting is not conventional rgb signal, the HDMI signal detecting is converted to conventional rgb signal output;

If the HDMI signal detecting is conventional rgb signal, the HDMI signal that directly output receives.

Preferably, after the step of the signal processing model of described definite HDMI interface place terminal, the method also comprises:

If determine, the signal processing model of HDMI interface place terminal is automatic identification model, determines the type of the HDMI signal detecting.

The present invention also proposes a kind of device that HDMI signal is processed, and comprising:

Detecting module, the HDMI signal receiving for detecting HDMI interface;

Determination module, for determining the type of the HDMI signal detecting

Modular converter, while not being conventional YCbCr signal for the HDMI signal when detecting, is converted to conventional YCbCr signal by the HDMI signal detecting;

Processing module, carries out image quality processing for the conventional YCbCr signal to after conversion;

Described modular converter is also for being converted to conventional rgb signal by the conventional YCbCr signal carrying out after image quality processing;

Output module, for exporting the conventional rgb signal after conversion.

The present invention proposes a kind of method and apparatus that HDMI signal is processed, when receiving HDMI signal, first determine the type of the HDMI signal receiving, when the HDMI signal receiving is vision signal, if the signal receiving is not conventional YCbCr signal, the HDMI signal receiving is converted to conventional YCbCr signal, and the conventional YCbCr signal after conversion is carried out to image quality processing, conventional YCbCr signal after image quality is processed is converted to conventional rgb signal output, bright in this vision signal, dark details picture can not lost when carrying out image quality processing and output, make the display frame contrast of video better, picture is more clear.

Accompanying drawing explanation

Fig. 1 is the schematic flow sheet of the present invention to method first embodiment of HDMI signal processing;

Fig. 2 is the schematic flow sheet of the present invention to method second embodiment of HDMI signal processing;

Fig. 3 is the schematic flow sheet of the present invention to method the 3rd embodiment of HDMI signal processing;

Fig. 4 is the idiographic flow schematic diagram of step S30 the first embodiment in Fig. 1;

Fig. 5 is the idiographic flow schematic diagram of step S30 the second embodiment in Fig. 1;

Fig. 6 is the idiographic flow schematic diagram of step S30 the second embodiment in Fig. 1;

Fig. 7 is the schematic flow sheet of the present invention to method the 4th embodiment of HDMI signal processing;

Fig. 8 is the schematic flow sheet of the present invention to method the 5th embodiment of HDMI signal processing;

Fig. 9 is the schematic flow sheet of the present invention to method the 6th embodiment of HDMI signal processing;

Figure 10 is the schematic flow sheet of the present invention to the device preferred embodiment of HDMI signal processing.

The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.

Embodiment

Below in conjunction with drawings and the specific embodiments, with regard to technical scheme of the present invention, be described further.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.

With reference to Fig. 1, Fig. 1 is the schematic flow sheet of the present invention to method first embodiment of HDMI signal processing.

The present embodiment proposes a kind of method the first embodiment that HDMI signal is processed, and comprising:

Step S10, the HDMI signal that detecting HDMI interface receives;

Step S20, the type of definite HDMI signal detecting;

Step S30, when the HDMI signal detecting is vision signal, and while not being conventional YCbCr signal, is converted to conventional YCbCr signal by the HDMI signal detecting;

The type of HDMI signal comprises YCbCr signal and rgb signal in the present embodiment, and YCbCr signal comprises conventional YCbCr signal and unconventional YCbCr signal, rgb signal comprises conventional rgb signal and unconventional rgb signal, conventional YCbCr signal and unconventional YCbCr signal refer to the signal that adopts respectively YCbCr_16～235 and YCbCr_0～255 to encode, and conventional rgb signal and unconventional rgb signal refer to adopt respectively the signal of RGB_0～255 and RGB_16～235 coding.

Can determine according to the ITC in HDMI signal, CN1 and CN0 flag the type of HDMI signal, only having this HDMI signal when ITC/CN1/CN0=1/0/0 is vision signal, the HDMI signal receiving during other situation is all desktop signals, and desktop signals refers to the signals such as local video, computer desktop, game and webpage.

The present embodiment when the HDMI signal that detect be vision signal, and while not being conventional YCbCr signal, this HDMI signal can be the signal of unconventional YCbCr, conventional rgb signal and unconventional rgb signal three types.When whether the HDMI signal receiving in judgement is conventional YCbCr signal, can first according to the Y1 of HDMI signal and Y0 flag, judge whether the HDMI signal detecting is YCbCr signal, if Y1/Y0=1/0 or 0/1 in HDMI signal, the HDMI signal detecting is YCbCr signal, then according to the YQ1 of HDMI signal and YQ0, judge whether the HDMI signal receiving is conventional YCbCr signal, the HDMI signal detecting when YQ1/YQ0=0/0 is conventional YCbCr signal, when YQ1/YQ0=0/1, the HDMI signal detecting is unconventional YCbCr signal, this unconventional YCbCr signal is converted to conventional YCbCr signal, if Y1/Y0=0/0, the HDMI signal that explanation detects is rgb signal, this rgb signal is converted to conventional YCbCr signal.

Step S40, carries out image quality processing to the conventional YCbCr signal after conversion, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

Image quality is processed the processing such as definition, noise reduction, color enhancing and dynamic contrast that refer to video.Existing terminal is as disc player, television set and computer etc. are to vision signal and carry out image quality while processing, all the unified YCbCr signal routinely of YCbCr signal is processed, according to YCbCr_16～235 coded system, for adopting the unconventional YCbCr of YCbCr_0～255 coded system to there will be 0～16 in YCbCr signal all by 16 processing, 235～255 all by 235 situations about processing, cause the dark of picture, bright loss in detail, and when vision signal is carried out to picture quality enhancement, this vision signal is necessary for YCbCr signal, unconventional YCbCr signal is all converted to conventional YCbCr signal, while making to show, picture contrast is stronger, and more clear.

YCbCr signal is converted to the formula of rgb signal for as follows:

$\left[\begin{array}{c}R\\ G\\ B\end{array}\right]=(1/256)*\left[\begin{array}{ccc}298.082& 0& 408.58\\ 298.082& -100.291& -208.12\\ 298.082& 516.411& 0\end{array}\right]*\left[\begin{array}{c}Y-16\\ \mathrm{Cb}-128\\ \mathrm{Cr}-128\end{array}\right]......\left(1\right)$

Wherein, R is that red color component, G are green chromatic component, and B is chroma blue component, and Y is luminance component, and Cb is chroma blue component, and Cr is red color component.

By this formula, conventional YCbCr signal can be converted to conventional rgb signal, this routine rgb signal can divide poor output by low pressure, and low pressure divides poor output to have advantages of low-power consumption, low error rate, low crosstalking and low radiation.

The method that HDMI signal is processed that the present embodiment proposes, when receiving HDMI signal, first determine the type of the HDMI signal receiving, when the HDMI signal receiving is vision signal, if the signal receiving is not conventional YCbCr signal, the HDMI signal receiving is converted to conventional YCbCr signal, and the conventional YCbCr signal after conversion is carried out to image quality processing, conventional YCbCr signal after image quality is processed is converted to conventional rgb signal output, bright in this vision signal, dark details picture can not lost when carrying out image quality processing and output, make the display frame contrast of video better, picture is more clear.

With reference to Fig. 2, Fig. 2 is the schematic flow sheet of the present invention to method second embodiment of HDMI signal processing.

Based on the first embodiment, propose method the second embodiment that the present invention processes HDMI signal, after step S20, also comprise in the present embodiment:

Step S50, when the HDMI signal detecting is desktop signals, whether the signal that judgement detects is conventional rgb signal;

Step S60, when the signal detecting is unconventional rgb signal, is converted to conventional rgb signal output by the HDMI signal detecting;

Step S70, when the signal detecting is conventional rgb signal, the HDMI signal that directly output detects.

Desktop signals refers to the signals such as local video, computer desktop, game and webpage, only comprise two types of conventional rgb signal and unconventional rgb signals, for example, when judging that according to the flag of HDMI signal this HDMI signal is desktop signals (ITC/CN1/CN0=0/0/0), whether the signal that can receive according to the numerical value judgement of flag Q1 and Q0 is conventional rgb signal, the HDMI signal receiving when Q1/Q0=1/0 is conventional rgb signal, now directly exports the HDMI signal that this detects.The HDMI signal receiving when Q1/Q0=0/1 is unconventional rgb signal, when the HDMI signal receiving is unconventional signal, the HDMI signal receiving is converted to conventional rgb signal, and the formula that unconventional rgb signal is converted to conventional rgb signal is as follows:

$\left[\begin{array}{c}{R}^{\′}\\ G^{\′}\\ B^{\′}\end{array}\right]=k1*\left[\begin{array}{c}R\\ G\\ B\end{array}\right]-16*k1......\left(2\right)$

Wherein, k1=255/ (235-16), R is that red color component, G are green chromatic component, B is chroma blue component.

Because unconventional rgb signal adopts RGB_16～235 coded system, when rgb signal being exported to processing, terminal is all processed RGB as conventional rgb signal RGB_0～255 coded system, cause the equal nothing of bright dark details, bright picture is bright not and dark picture is dark not, cause contrast inadequate, picture lacks unity and coherence.

In the present embodiment, when receiving HDMI signal, first determine the type of the HDMI signal receiving, when the HDMI signal receiving is desktop signals, desktop signals is converted to conventional rgb signal output, because desktop signals is focused on reproducibility and is not needed to carry out image quality processing when showing, and vision signal need to be carried out image quality and processed and to make its display effect better, by distinguishing the type of HDMI signal and correspondingly processing, make the display effect of the signal that receives better.

With reference to Fig. 3, Fig. 3 is the schematic flow sheet of the present invention to method the 3rd embodiment of HDMI signal processing.

Based on the first embodiment, propose method the 3rd embodiment that the present invention processes HDMI signal, in the present embodiment, after step S20, also comprise:

Step S80, when the HDMI signal detecting is vision signal, and while being conventional YCbCr signal, carries out image quality processing to the HDMI signal detecting, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

The HDMI signal detecting when YQ1/YQ0=0/0 is conventional YCbCr signal, now do not need HDMI signal to detecting to change directly this HDMI signal is carried out to image quality processing, and the HDMI signal after this image quality is processed is converted to conventional rgb signal output, HDMI signal is converted to the method for conventional rgb signal and sees formula (1), because conventional YCbCr signal is YCbCr_16～235 coded system, directly it is processed and there will not be problem bright, dark loss in detail.

With reference to Fig. 4, Fig. 4 is the idiographic flow schematic diagram of step S30 the first embodiment in Fig. 1.

In method the first embodiment HDMI signal being processed in the present invention, step S30 comprises:

Step S31, when the HDMI signal detecting is vision signal, and the HDMI signal detecting is conventional rgb signal, conventional rgb signal is converted to conventional YCbCr signal;

When whether the HDMI signal receiving in judgement is conventional rgb signal, can first according to the Y1 of HDMI signal and Y0 flag, judge whether the HDMI signal detecting is rgb signal, if Y1/Y0=0/0, the HDMI signal that explanation detects is rgb signal, whether the signal now receiving according to the numerical value judgement of the Q1 of this HDMI signal and Q0 flag is conventional rgb signal, the HDMI signal receiving when Q1/Q0=1/0 is conventional rgb signal, this routine rgb signal is directly converted to conventional YCbCr signal, conversion method is shown in formula (3).

Step S32, carries out image quality processing to the conventional YCbCr signal after conversion, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

With reference to Fig. 5, Fig. 5 is the idiographic flow schematic diagram of step S30 the second embodiment in Fig. 1.

In method the first embodiment HDMI signal being processed in the present invention, step S30 comprises:

Step S33, when the HDMI signal detecting is vision signal, and described HDMI signal is unconventional rgb signal, described HDMI signal is converted to conventional rgb signal;

Step S34, is converted to conventional YCbCr signal by conventional rgb signal;

The formula that conventional rgb signal is converted to conventional YCbCr signal is as follows:

$\left[\begin{array}{c}Y\\ \mathrm{Cb}\\ \mathrm{Cr}\end{array}\right]=\left[\begin{array}{c}16\\ 128\\ 128\end{array}\right]+(1/256)*\left[\begin{array}{ccc}65.738& 129.057& 25.06\\ -37.945& -74.494& 112.43\\ 112.439& -94.154& -18.28\end{array}\right]*\left[\begin{array}{c}R\\ G\\ B\end{array}\right]......\left(3\right)$

Wherein, R is that red color component, G are green chromatic component, and B is chroma blue component, and Y is luminance component, and Cb is chroma blue component, and Cr is red color component.

The HDMI signal receiving when Q1/Q0=0/1 is unconventional rgb signal, now the HDMI signal detecting is converted to conventional rgb signal, because unconventional rgb signal is different from the value of R, G, B in conventional rgb signal, when being directly converted to conventional YCbCr signal according to formula (3), unconventional rgb signal there will be error, cause HDMI signal when showing, to occur misalignment, now need to adopt formula (2) first unconventional rgb signal to be converted into conventional rgb signal, then conventional rgb signal is transferred to for conventional YCbCr signal according to formula (3).

Step S32, carries out image quality processing to the conventional YCbCr signal after conversion, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

With reference to Fig. 6, Fig. 6 is the idiographic flow schematic diagram of step S30 the second embodiment in Fig. 1.

In method the first embodiment HDMI signal being processed in the present invention, step S30 comprises:

Step S35, if the HDMI signal detecting is not rgb signal, is converted to conventional YCbCr signal by the HDMI signal detecting;

If the HDMI signal detecting is not in the present embodiment rgb signal and is not conventional YCbCr signal, this signal is unconventional YCbCr signal, when whether the HDMI signal receiving in judgement is conventional YCbCr signal, can first according to the Y1 of HDMI signal and Y0 flag, judge whether the HDMI signal detecting is YCbCr signal, if Y1/Y0=1/0 or 0/1 in HDMI signal, the HDMI signal detecting is YCbCr signal, then according to the YQ1 of HDMI signal and YQ0, judge whether the HDMI signal receiving is conventional YCbCr signal, when YQ1/YQ0=0/1, the HDMI signal detecting is unconventional YCbCr signal, this unconventional YCbCr signal is converted to conventional YCbCr signal, the formula that unconventional YCbCr signal is converted to conventional YCbCr signal is as follows:

$\left[\begin{array}{c}{Y}^{\′}\\ {\mathrm{Cb}}^{\′}\\ {\mathrm{Cr}}^{\′}\end{array}\right]=k2*\left[\begin{array}{c}Y\\ \mathrm{Cb}\\ \mathrm{Cr}\end{array}\right]+\left[\begin{array}{c}16\\ 128*(1-k2)\\ 128*(1-k2)\end{array}\right]......\left(4\right);$

Wherein, k2=(235-16)/255, Y is luminance component, and Cb is chroma blue component, and Cr is red color component.。

Step S32, carries out image quality processing to the conventional YCbCr signal after conversion, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

With reference to Fig. 7, Fig. 7 is the schematic flow sheet of the present invention to method the 4th embodiment of HDMI signal processing.

Based on the first to the 3rd embodiment, propose method the 4th embodiment that the present invention processes HDMI signal, after step S10, also comprise in the present embodiment:

Step S90, determines the signal processing model of HDMI interface place terminal;

Step S100, if the signal processing model of HDMI interface place terminal is video mode, whether the HDMI signal that judgement detects is conventional YCbCr signal;

When the HDMI signal detecting is not conventional YCbCr signal, perform step S30, the HDMI signal detecting is converted to conventional YCbCr signal;

Step S40, carries out image quality processing to the conventional YCbCr signal after conversion, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

Predeterminable terminal (the disc player of user in the present embodiment, computer etc.) signal processing model, this signal processing model comprises video mode, no matter the signal detecting is that vision signal or desktop signals are all processed by vision signal, the HDMI signal that ought detect is not conventional YCbCr signal, by the HDMI signal detecting (unconventional YCbCr signal, conventional rgb signal and unconventional rgb signal) be converted to conventional YCbCr signal and carry out image quality processing, then the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output, the HDMI signal that is applicable to terminal input is during only for vision signal, can omit the deterministic process of HDMI signal type, processing to HDMI signal is quicker, save overhead, and can independently be selected by user the tupe of HDMI signal, user experience is high.

With reference to Fig. 8, Fig. 8 is the schematic flow sheet of the present invention to method the 5th embodiment of HDMI signal processing.

Based on the 4th embodiment, propose method the 5th embodiment that the present invention processes HDMI signal, after step S90, also comprise in the present embodiment:

If determine, the signal processing model of HDMI interface place terminal is desktop, performs step S50, and whether the HDMI signal that judgement receives is conventional rgb signal;

Step S60, when the HDMI signal detecting is not conventional rgb signal, is converted to the HDMI signal detecting conventional rgb signal output;

Step S70, if the HDMI signal detecting is conventional rgb signal, the HDMI signal that directly output receives.

Under desktop, no matter the signal detecting is that vision signal or desktop signals are all processed by desktop signals, when the HDMI signal detecting is when being not conventional rgb signal, by HDMI signal (the unconventional rgb signal detecting, conventional YCbCr signal and unconventional YCbCr signal) be converted to conventional rgb signal and export, wherein, before unconventional YCbCr signal is converted to conventional rgb signal, need first according to formula (4), unconventional YCbCr signal to be converted to conventional YCbCr signal, then according to formula (1), conventional YCbCr signal is converted to conventional rgb signal.

The HDMI signal that the scheme that the present embodiment proposes is applicable to terminal input is during only for desktop signals, can omit the deterministic process of HDMI signal type, quicker to the processing of HDMI signal, save overhead, and can by user, independently be selected the tupe of HDMI signal, user experience is high.

With reference to Fig. 9, Fig. 9 is the schematic flow sheet of the present invention to method the 6th embodiment of HDMI signal processing.

Based on the 4th embodiment and the 5th embodiment, propose method the 6th embodiment that the present invention processes HDMI signal, after step S90, also comprise in the present embodiment:

If determine, the signal processing model of HDMI interface place terminal is automatic identification model, performs step S20, determines the type of the HDMI signal detecting;

Step S30, when the HDMI signal detecting is vision signal, and while not being conventional YCbCr signal, is converted to conventional YCbCr signal by the HDMI signal detecting;

Step S40, carries out image quality processing to the conventional YCbCr signal after conversion, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

Under automatic identification model, terminal can be identified the HDMI signal detecting, reproducibility due to desktop signals emphasis signal, do not need desktop signals to carry out picture quality enhancement processing, and vision signal is in order to strengthen display effect, need to carry out corresponding picture quality enhancement processing, under adaptive model, according to the type of the HDMI signal detecting, HDMI signal is correspondingly processed, make terminal better to the display effect of HDMI signal, and in the present embodiment, can by user, independently be selected the tupe of HDMI signal, user experience is high.

With reference to Figure 10, Figure 10 is the schematic flow sheet of the present invention to the device preferred embodiment of HDMI signal processing.

The present embodiment proposes a kind of device that HDMI signal is processed, and comprising:

Detecting module 10, the HDMI signal receiving for detecting HDMI interface;

Determination module 20, for determining the type of the HDMI signal detecting

Modular converter 30, for when to detect HDMI signal be vision signal, and HDMI signal is not while being conventional YCbCr signal, and the HDMI signal detecting is converted to conventional YCbCr signal;

The type of HDMI signal comprises YCbCr signal and rgb signal in the present embodiment, and YCbCr signal comprises conventional YCbCr signal and unconventional YCbCr signal, rgb signal comprises conventional rgb signal and unconventional rgb signal, conventional YCbCr signal and unconventional YCbCr signal refer to the signal that adopts respectively YCbCr_16～235 and YCbCr_0～255 to encode, and conventional rgb signal and unconventional rgb signal refer to adopt respectively the signal of RGB_0～255 and RGB_16～235 coding.

Can determine according to the ITC in HDMI signal, CN1 and CN0 flag the type of HDMI signal, only having this HDMI signal when ITC/CN1/CN0=1/0/0 is vision signal, the HDMI signal receiving during other situation is all desktop signals, and desktop signals refers to the signals such as local video, computer desktop, game and webpage.

The present embodiment when the HDMI signal that detect be vision signal, and while not being conventional YCbCr signal, this HDMI signal can be the signal of unconventional YCbCr, conventional rgb signal and unconventional rgb signal three types.When whether the HDMI signal receiving in judgement is conventional YCbCr signal, can first according to the Y1 of HDMI signal and Y0 flag, judge whether the HDMI signal detecting is YCbCr signal, if Y1/Y0=1/0 or 0/1 in HDMI signal, the HDMI signal detecting is YCbCr signal, then according to the YQ1 of HDMI signal and YQ0, judge whether the HDMI signal receiving is conventional YCbCr signal, the HDMI signal detecting when YQ1/YQ0=0/0 is conventional YCbCr signal, when YQ1/YQ0=0/1, the HDMI signal detecting is unconventional YCbCr signal, this unconventional YCbCr signal is converted to conventional YCbCr signal, if Y1/Y0=0/0, the HDMI signal that explanation detects is rgb signal, this rgb signal is converted to conventional YCbCr signal.

Processing module 40, carries out image quality processing for the conventional YCbCr signal to after conversion;

Described modular converter 30 is also for being converted to conventional rgb signal by the conventional YCbCr signal carrying out after image quality processing;

Output module 50, for exporting the conventional rgb signal after conversion.

Image quality is processed the processing such as definition, noise reduction, color enhancing and dynamic contrast that refer to video.Existing terminal is as disc player, television set and computer etc. are to vision signal and carry out image quality while processing, all the unified YCbCr signal routinely of YCbCr signal is processed, according to YCbCr_16～235 coded system, for adopting the unconventional YCbCr of YCbCr_0～255 coded system to there will be 0～16 in YCbCr signal all by 16 processing, 235～255 all by 235 situations about processing, cause the dark of picture, bright loss in detail, and when vision signal is carried out to picture quality enhancement, this vision signal is necessary for YCbCr signal, unconventional YCbCr signal is all converted to conventional YCbCr signal, while making to show, picture contrast is stronger, and more clear.

YCbCr signal is converted to the formula of rgb signal for as follows:

$\left[\begin{array}{c}R\\ G\\ B\end{array}\right]=(1/256)*\left[\begin{array}{ccc}298.082& 0& 408.58\\ 298.082& -100.291& -208.12\\ 298.082& 516.411& 0\end{array}\right]*\left[\begin{array}{c}Y-16\\ \mathrm{Cb}-128\\ \mathrm{Cr}-128\end{array}\right]......\left(1\right)$

Wherein, R is that red color component, G are green chromatic component, and B is chroma blue component, and Y is luminance component, and Cb is chroma blue component, and Cr is red color component.

By this formula, conventional YCbCr signal can be converted to conventional rgb signal, this routine rgb signal can divide poor output by low pressure, and low pressure divides poor output to have advantages of low-power consumption, low error rate, low crosstalking and low radiation.

The device that HDMI signal is processed that the present embodiment proposes, when receiving HDMI signal, first determine the type of the HDMI signal receiving, when the HDMI signal receiving is vision signal, if the signal receiving is not conventional YCbCr signal, the HDMI signal receiving is converted to conventional YCbCr signal, and the conventional YCbCr signal after conversion is carried out to image quality processing, conventional YCbCr signal after image quality is processed is converted to conventional rgb signal output, bright in this vision signal, dark details picture can not lost when carrying out image quality processing and output, make the display frame contrast of video better, picture is more clear.

In the device preferred embodiment of HDMI signal being processed in the present invention, modular converter 30 is also desktop signals for the HDMI signal when detecting, and while being unconventional rgb signal, the HDMI signal detecting is converted to conventional rgb signal, when described output module 50 is also conventional rgb signal for the signal when detecting, connect the HDMI signal that output detects.

Desktop signals refers to the signals such as local video, computer desktop, game and webpage, only comprise two types of conventional rgb signal and unconventional rgb signals, for example, when judging that according to the flag of HDMI signal this HDMI signal is desktop signals (ITC/CN1/CN0=0/0/0), whether the signal that can receive according to the numerical value judgement of flag Q1 and Q0 is conventional rgb signal, the HDMI signal receiving when Q1/Q0=1/0 is conventional rgb signal, now directly exports the HDMI signal that this detects.The HDMI signal receiving when Q1/Q0=0/1 is unconventional rgb signal, when the HDMI signal receiving is unconventional signal, modular converter 30 is converted to conventional rgb signal by the HDMI signal receiving, and the formula that modular converter 30 is converted to conventional rgb signal by unconventional rgb signal is as follows:

$\left[\begin{array}{c}{R}^{\′}\\ G^{\′}\\ B^{\′}\end{array}\right]=k1*\left[\begin{array}{c}R\\ G\\ B\end{array}\right]-16*k1......\left(2\right)$

K1=255/ (235-16) wherein, R is that red color component, G are green chromatic component, B is chroma blue component.

Because non-rgb signal adopts RGB_16～235 coded system, when rgb signal being exported to processing, terminal is all processed RGB as conventional rgb signal RGB_0～255 coded system, cause the equal nothing of bright dark details, bright picture is bright not and dark picture is dark not, cause contrast inadequate, picture lacks unity and coherence.

In the present embodiment, when receiving HDMI signal, first determine the type of the HDMI signal receiving, when the HDMI signal receiving is desktop signals, modular converter 30 is converted to conventional rgb signal by desktop signals, conventional rgb signal after output module output conversion, because desktop signals is focused on reproducibility and is not needed to carry out image quality processing when showing, and vision signal need to be carried out image quality and processed and to make its display effect better, by distinguishing the type of HDMI signal and correspondingly processing, make the display effect of the signal that receives better.

In the device preferred embodiment of HDMI signal being processed in the present invention, described processing module 40 is also vision signal for the HDMI signal when detecting, and while being conventional YCbCr signal, the HDMI signal detecting is carried out to image quality processing.

The HDMI signal detecting when YQ1/YQ0=0/0 is conventional YCbCr signal, now modular converter 30 does not need the HDMI signal to detecting to change, processing module 40 is directly carried out image quality processing to this HDMI signal, HDMI signal after modular converter 30 is processed this image quality is converted to conventional rgb signal and exports by output module 50, the method that modular converter 30 is converted to conventional rgb signal by HDMI signal is shown in formula (1), because conventional YCbCr signal is YCbCr_16～235 coded system, directly to its process there will not be bright, the problem of dark loss in detail.

In the device preferred embodiment of HDMI signal being processed in the present invention, if described modular converter 30 is also vision signal for the HDMI signal detecting, and while being conventional rgb signal, conventional rgb signal is converted to conventional YCbCr signal.

When whether the HDMI signal receiving in judgement is conventional YCbCr signal, can first according to the Y1 of HDMI signal and Y0 flag, judge whether the HDMI signal detecting is YCbCr signal, if Y1/Y0=0/0, the HDMI signal that explanation detects is rgb signal, whether the signal now receiving according to the numerical value judgement of the Q1 of this HDMI signal and Q0 flag is conventional rgb signal, the HDMI signal receiving when Q1/Q0=1/0 is conventional rgb signal, this routine rgb signal is directly converted to conventional YCbCr signal, conversion method is shown in formula (3).

In the device preferred embodiment of HDMI signal being processed in the present invention, described modular converter 30 is also vision signal for working as described HDMI signal, and while being unconventional rgb signal, described HDMI signal is converted to conventional rgb signal, and conventional rgb signal is converted to conventional YCbCr signal.

The formula that conventional rgb signal is converted to conventional YCbCr signal is as follows:

$\left[\begin{array}{c}Y\\ \mathrm{Cb}\\ \mathrm{Cr}\end{array}\right]=\left[\begin{array}{c}16\\ 128\\ 128\end{array}\right]+(1/256)*\left[\begin{array}{ccc}65.738& 129.057& 25.06\\ -37.945& -74.494& 112.43\\ 112.439& -94.154& -18.28\end{array}\right]*\left[\begin{array}{c}R\\ G\\ B\end{array}\right]......\left(3\right)$

Wherein, R is that red color component, G are green chromatic component, and B is chroma blue component, and Y is luminance component, and Cb is chroma blue component, and Cr is red color component.

The HDMI signal receiving when Q1/Q0=0/1 is unconventional rgb signal, now the HDMI signal detecting is converted to conventional rgb signal, because unconventional rgb signal is different from the value of R, G, B in conventional rgb signal, when being directly converted to conventional YCbCr signal according to formula (3), unconventional rgb signal there will be error, cause HDMI signal when showing, to occur misalignment, now need first to adopt formula (2) that unconventional rgb signal is converted into conventional rgb signal, then conventional rgb signal is transferred to for conventional YCbCr signal according to formula (3).

In the device preferred embodiment of HDMI signal being processed in the present invention, if the HDMI signal detecting is vision signal, and while being unconventional YCbCr signal, the HDMI signal detecting is converted to conventional YCbCr signal.

If the HDMI signal detecting is in the present embodiment unconventional YCbCr signal, when whether the HDMI signal receiving in judgement is conventional YCbCr signal, can first according to the Y1 of HDMI signal and Y0 flag, judge whether the HDMI signal detecting is YCbCr signal, if Y1/Y0=1/0 or 0/1 in HDMI signal, the HDMI signal detecting is YCbCr signal, then according to the YQ1 of HDMI signal and YQ0, judge whether the HDMI signal receiving is conventional YCbCr signal, when YQ1/YQ0=0/1, the HDMI signal detecting is unconventional YCbCr signal, this unconventional YCbCr signal is converted to conventional YCbCr signal, the formula that unconventional YCbCr signal is converted to conventional YCbCr signal is as follows:

$\left[\begin{array}{c}{Y}^{\′}\\ {\mathrm{Cb}}^{\′}\\ {\mathrm{Cr}}^{\′}\end{array}\right]=k2*\left[\begin{array}{c}Y\\ \mathrm{Cb}\\ \mathrm{Cr}\end{array}\right]+\left[\begin{array}{c}16\\ 128*(1-k2)\\ 128*(1-k2)\end{array}\right]......\left(4\right);$

Wherein, k2=(235-16)/255, Y is luminance component, and Cb is chroma blue component, and Cr is red color component.。

In the device preferred embodiment of HDMI signal being processed in the present invention, described determination module 20 is also for determining the signal processing model of HDMI interface place terminal; If determine, the signal processing model of HDMI interface place terminal is video mode, and when the HDMI signal detecting is not conventional YCbCr signal, modular converter 30 is converted to conventional YCbCr signal by the HDMI signal detecting.

Predeterminable terminal (the disc player of user in the present embodiment, computer etc.) signal processing model, this signal processing model comprises video mode, no matter the signal detecting is that vision signal or desktop signals are all processed by vision signal, the HDMI signal that ought detect is not conventional YCbCr signal, by the HDMI signal detecting (unconventional YCbCr signal, conventional rgb signal and unconventional rgb signal) be converted to conventional YCbCr signal and carry out image quality processing, then the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output, the HDMI signal that is applicable to terminal input is during only for vision signal, can omit the deterministic process of HDMI signal type, processing to HDMI signal is quicker, save overhead, and can independently be selected by user the tupe of HDMI signal, user experience is high.

In the device preferred embodiment of HDMI signal being processed in the present invention, if determination module 20 determines that the signal processing model of HDMI interface place terminal is desktop, and when the HDMI signal detecting is not conventional rgb signal, modular converter 30 is converted to conventional rgb signal output by the HDMI signal detecting; If the HDMI signal detecting is conventional rgb signal, the output module 50 HDMI signal that directly output receives.

Under desktop, no matter the signal detecting is that vision signal or desktop signals are all processed by desktop signals, when the HDMI signal detecting is when being not conventional rgb signal, by HDMI signal (the unconventional rgb signal detecting, conventional YCbCr signal and unconventional YCbCr signal) be converted to conventional rgb signal and export, wherein, before unconventional YCbCr signal is converted to conventional rgb signal, need first according to formula (4), unconventional YCbCr signal to be converted to conventional YCbCr signal, then according to formula (1), conventional YCbCr signal is converted to conventional rgb signal.

The HDMI signal that the scheme that the present embodiment proposes is applicable to terminal input is during only for desktop signals, can omit the deterministic process of HDMI signal type, quicker to the processing of HDMI signal, save overhead, and can by user, independently be selected the tupe of HDMI signal, user experience is high.

In the device preferred embodiment of HDMI signal being processed in the present invention, if described determination module 20 is also for determining that the signal processing model of HDMI interface place terminal is automatic identification model, determine the type of the HDMI signal detecting.

Under automatic identification model, terminal can be identified the HDMI signal detecting, reproducibility due to desktop signals emphasis signal, do not need desktop signals to carry out picture quality enhancement processing, and vision signal is in order to strengthen display effect, need to carry out corresponding picture quality enhancement processing, under adaptive model, according to the type of the HDMI signal detecting, HDMI signal is correspondingly processed, make terminal better to the display effect of HDMI signal, and in the present embodiment, can by user, independently be selected the tupe of HDMI signal, user experience is high.

The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure transformation that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (10)

1. a method of HDMI signal being processed, is characterized in that, comprising:

The HDMI signal that detecting HDMI interface receives, the type of definite HDMI signal detecting;

When the HDMI signal detecting is vision signal, and while not being conventional YCbCr signal, the HDMI signal detecting is converted to conventional YCbCr signal;

Conventional YCbCr signal after conversion is carried out to image quality processing, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

2. according to the method described in right 1, it is characterized in that, after the step of the type of described definite HDMI signal detecting, also comprise:

When the HDMI signal detecting is desktop signals, and while being unconventional rgb signal, the HDMI signal detecting is converted to conventional rgb signal output.

When the HDMI signal detecting is desktop signals, and while being conventional rgb signal, the HDMI signal that directly output detects.

3. according to the method described in right 1, it is characterized in that the HDMI signal that described detecting HDMI interface receives determines that the step of the type of the HDMI signal detecting also comprises afterwards:

When the HDMI signal detecting is vision signal, and while being conventional YCbCr signal, the HDMI signal detecting is carried out to image quality processing, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

4. method according to claim 1, is characterized in that, the described step that the HDMI signal detecting is converted to conventional YCbCr signal comprises:

If the HDMI signal detecting is conventional rgb signal, conventional rgb signal is converted to conventional YCbCr signal;

Conventional YCbCr signal after conversion is carried out to image quality processing, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

5. method according to claim 1, is characterized in that, the described step that the HDMI signal detecting is converted to conventional YCbCr signal also comprises:

If described HDMI signal is unconventional rgb signal, described HDMI signal is converted to conventional rgb signal;

Conventional rgb signal is converted to conventional YCbCr signal;

Conventional YCbCr signal after conversion is carried out to image quality processing, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

6. method according to claim 1, is characterized in that, the described step that the HDMI signal detecting is converted to conventional YCbCr signal also comprises:

If the HDMI signal detecting is not rgb signal, the HDMI signal detecting is converted to conventional YCbCr signal;

Conventional YCbCr signal after conversion is carried out to image quality processing, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

7. method according to claim 1, is characterized in that, after the step of the HDMI signal that described detecting HDMI interface receives, the method also comprises:

Determine the signal processing model of HDMI interface place terminal;

If determine, the signal processing model of HDMI interface place terminal is video mode, and whether the HDMI signal that judgement detects is conventional YCbCr signal;

When the HDMI signal detecting is not conventional YCbCr signal, the HDMI signal detecting is converted to conventional YCbCr signal;

Conventional YCbCr signal after conversion is carried out to image quality processing, and the conventional YCbCr signal carrying out after image quality processing is converted to conventional rgb signal output.

8. method according to claim 7, is characterized in that, after the step of the signal processing model of described definite HDMI interface place terminal, the method also comprises:

If determine, the signal processing model of HDMI interface place terminal is desktop, and whether the HDMI signal that judgement receives is conventional rgb signal;

When the HDMI signal detecting is not conventional rgb signal, the HDMI signal detecting is converted to conventional rgb signal output;

If the HDMI signal detecting is conventional rgb signal, the HDMI signal that directly output receives.

9. method according to claim 7, is characterized in that, after the step of the signal processing model of described definite HDMI interface place terminal, the method also comprises:

If determine, the signal processing model of HDMI interface place terminal is automatic identification model, determines the type of the HDMI signal detecting.

10. a device of HDMI signal being processed, is characterized in that, comprising:

Detecting module, the HDMI signal receiving for detecting HDMI interface;

Determination module, for determining the type of the HDMI signal detecting

Modular converter, for being vision signal when the HDMI signal that detect, and while not being conventional YCbCr signal, is converted to conventional YCbCr signal by the HDMI signal detecting;

Processing module, carries out image quality processing for the conventional YCbCr signal to after conversion;

Described modular converter is also for being converted to conventional rgb signal by the conventional YCbCr signal carrying out after image quality processing;

Output module, for exporting the conventional rgb signal after conversion.

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